I noticed you're running azenis in the picture. A local guy tried those last season and said that it made for an awful lot of oversteer due to the available size. I think the rear sizes were too narrow?
At the top of the page you can see my 245/40/17 Yok rear tires. As I said, I went with this mix package of tires in order to match the sizes that the car owner was running in Hoosier R's. Correct, there were no matching Falkens for the rear, and no matching Yoks for the front. Yes, it was a failed experiment!
When we were first trying out the car, we noted the snap oversteer. I thought putting the sticker Yoks in back might help that situation.
The car owner, an experienced road racer using real race cars, not sedans, finally drove the car with the street tires again at the end of the season and noted what a handful it was. Even with the not very used Yoks, stored bagged in a cool environment between events, it was hard to get the power down, even with our LSD.
Where as his R tires transformed the Elise into a great tool, my selection of tires made it into a less fun toy. One had to really transfer weight onto the front tires to get them to turn in nicely, but a bit too much and it pushed. Not enough, and it pushed.
A bigger front sway bar on a properly set-up (race) car adds push. But on a pig like a Subaru it definitely helps reduce understeer by controlling front end roll, which takes away Camber. I don't know why it helps control snap oversteer on the Elise ... BUT IT DEFINITELY Transformed our Track Pack Elise. We've got our Camber maxed out, a bit of toe out in the front (helps turn in), a bit of toe-in in back (to help plant the rear on corner exit) lowered to the advised limit and we have carefully devised damper settings for the two different surfaces that we run on.
I'll ask the car owner why he felt the bigger bar made our Elise work.
oem sway bar:
Blackwatch bigger bar:
looking for photos ... back later ...